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ARROW-18174: [R] Fix compile of altrep.cpp on some builds (#14530)

After ARROW-17187 (#14271), we get at least two nightly build failures because of how cpp11 objects are constructed in some new test functions. This PR makes the constructors less ambiguous so that no compilers give us trouble!

Lead-authored-by: Dewey Dunnington <dewey@fishandwhistle.net>
Co-authored-by: Dewey Dunnington <dewey@voltrondata.com>
Signed-off-by: Nic Crane <thisisnic@gmail.com>